Only after did people know it was not an accident, but an attack of some kind.A. the second tower of the World Trade Centre was hitB. did the second tower of the World Trade Centre fallC. was the seco 题目和参考答案——青夏教育精英家教网—

题目内容

Only after did people know it was not an accident, but an attack of some kind.

A. the second tower of the World Trade Centre was hit

B. did the second tower of the World Trade Centre fall

C. was the second tower of the World Trade Centre hit

D. the second tower of the World Trade Centre was fallen

解析：only后的状语从句不倒装，主句倒装，排除B、C项；fall不可用于被动语态。故选A。句意为：只有在世界贸易中心的第二座塔被撞上后，人们才知道这不是事故，而是某种袭击。

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Not only governments but ordinary people as well must work together to solve the problem. They can choose not to buy those products which require the production of dangerous waste, and produce less harmful waste themselves. Many scientists think that waste production can be cut. The waste can be reduced by at least one third using existing technologies and methods.

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A．Measures of Reducing Dangerous Waste

B．Danger of Harmful Waste to Mankind

C．Dangerous Waste and Water Pollution

D．Environmental Protection

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